/* Copyright 2015 The TensorFlow Authors. All Rights Reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
==============================================================================*/

#ifndef TENSORFLOW_CORE_COMMON_RUNTIME_COSTMODEL_H_
#define TENSORFLOW_CORE_COMMON_RUNTIME_COSTMODEL_H_

#include "tensorflow/core/common_runtime/kernel_stat.h"

namespace tensorflow {
namespace ExecutorInternal {

// TODO: consider integrate this to tensorflow/core/graph/costmodel.h
class ExecuteCostModel {
 public:
  ExecuteCostModel() {}
  ~ExecuteCostModel() {}

  void BuildCostModel(KernelStats* stats) {
    kernel_stats_ = stats;
    node_count_ = kernel_stats_->GetNodeCount();
    // TODO: build actual cost model here
  }

  int64 GetNodeCost(const NodeItem* item) {
    // TODO: return actual cost
    return kernel_stats_->GetNodeCost(item);
  }

 private:
  KernelStats* kernel_stats_ = nullptr; // not owned
  int64 node_count_;
};

}  // end namespace ExecutorInternal
}  // end namespace tensorflow

#endif  // TENSORFLOW_CORE_COMMON_RUNTIME_COSTMODEL_H_

